Stand facing a wall or solid surface and place your hands on it for support. Step one leg back with the heel flat on the ground and the knee straight. Bend the front knee and lean your hips forward until you feel a gentle stretch in the calf of the back leg. Hold the position with controlled breathing, then switch sides.
Log your standing gastrocnemius sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.